Infants' dietary arsenic exposure during transition to solid food

Antonio J Signes-Pastor, Kathryn L Cottingham, Manus Carey, Vicki Sayarath, Thomas Palys, Andrew A Meharg, Carol L Folt, Margaret R Karagas, Antonio J Signes-Pastor, Kathryn L Cottingham, Manus Carey, Vicki Sayarath, Thomas Palys, Andrew A Meharg, Carol L Folt, Margaret R Karagas

Abstract

Early-life exposure to inorganic arsenic (i-As) may cause long-lasting health effects, but as yet, little is known about exposure among weaning infants. We assessed exposure before and during weaning and investigated the association between solid food intake and infants' urinary arsenic species concentrations. Following the recording of a comprehensive 3 day food diary, paired urine samples (pre- and post-weaning) were collected and analyzed for arsenic speciation from 15 infants participating in the New Hampshire Birth Cohort Study. Infants had higher urinary i-As (p-value = 0.04), monomethylarsonic acid (MMA) (p-value = 0.002), dimethylarsinic acid (DMA) (p-value = 0.01), and sum of arsenic species (i-As + MMA + DMA, p-value = 0.01) during weaning than while exclusively fed on a liquid diet (i.e., breast milk, formula, or a mixture of both). Among weaning infants, increased sum of urinary arsenic species was pairwise-associated with intake of rice cereal (Spearman's ρ = 0.90, p-value = 0.03), fruit (ρ = 0.70, p-value = 0.03), and vegetables (ρ = 0.86, p-value = 0.01). Our observed increases in urinary arsenic concentrations likely indicate increased exposure to i-As during the transition to solid foods, suggests the need to minimize exposure during this critical period of development.

Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Concentrations of urinary arsenic species before (at 4 months of age) and during weaning (at 6 months of age) to solid foods. At 6 months of age infants’ diets included solid food in addition to breast milk, formula, or a mixture of both breast milk and formula. Each infant is identified by a unique color to facilitate the comparison between the two time points. The p-values were derived from paired Wilcoxon signed-rank test analyses. Urinary arsenic species concentrations were natural logarithm transformed to help visualization.
Figure 2
Figure 2
Concentrations of infant urinary arsenic species in relation to intake of specific foods at 6 months of age. Each infant is identified by a unique color. Spearman’s correlation coefficient and p-value for each dietary item. Urinary arsenic species concentration and solid food consumption were natural logarithm transformed to help visualization. The least-squares regression line is also included to help visualize associations. *Infant P14 was not included in Spearman’s correlation between urinary arsenic species content and the formula powder intake level (outlier).

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